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V-belts ( style V-belts, vee belts, or, less commonly, wedge rope) are the most common type of drive belt used on engines to transmit power.

  • It eliminates the slippage and alignment problem and is now the most common belt type for power transmission.
  • They transfer power from a primary pulley to one or more pulleys or driven units.
  • They provide good speed transfer, load distribution, and service life.
  • The V- belt has a V-shaped crosssection that wedges into pulley grooves of matching width. Friction between the sides of the belt and the sides of the pulley grooves transmits the power. Power is not being transmitted through the bottom of the V - belt.
  • The ribbed or serpentine belt has a series of  V-shaped ridges that act as a series of small V- belt, The ribs or ridges wedges into matching grooves in the pulleys. Friction between the sides of the small ridges and grooves transmits the power.
  • Some older engines needed four to five V belts to drive   all then engine- driven devices